There used to be two piles of coal in the boiler room of the school, weighing 24 tons. Now we add 4 tons to the small coal pile and use 1/4 of the large coal pile. The two piles of coal weigh exactly the same. How many tons are these two piles of coal?
3. A work can be completed in 9 days, 5/6 in 20 days and 6 days. How many days does it take a person to complete this work?
4. A key opens a lock. Now there are five keys and five locks. How many times can I open all the locks at most?
5. In a pasture, the pasture grows evenly and can feed 25 cows 10 day, or 15 cows for 20 days. Q: How many days can this pasture feed 45 cows?
6. A person rides a bicycle from the county seat to the township to set up a factory. He started from the county seat by bike and completed half the journey in 30 minutes. At this time, he sped up, driving 50 meters more every minute than before. After riding for another 20 minutes, he knew from the mileage card on the roadside that he had to ride another 2 kilometers to set up a factory in the township, and asked for the total distance from the county to the township.
7.250 cases of glassware are consigned, and the freight per case is 20 yuan as stipulated in the contract. If there is any loss, the damaged box will not only pay the freight, but also compensate for the loss of 100 yuan per box. How many cases can be damaged at most when freight is required for transportation settlement?
There are two barrels of 44 kilograms of oil. If the first barrel pours 1/5 and the second barrel pours 2.8kg, the two barrels of oil are equal. So how many kilograms was the first barrel of oil at first? How much is the second barrel of oil?
9. The school bought four footballs and six volleyballs from Zhong Bai supermarket, and spent 660 yuan. Later, the unit price of football in supermarkets in Zhong Bai increased by 10%, and the unit price of volleyball was cheaper by 15%, so * * * needed 636 yuan. What is the unit price of football and volleyball?
10. After adding a certain amount of water to some salt water, the concentration of salt water decreased to 3%, and after adding the same amount of water, the concentration decreased to 2%. Q: How much did the concentration decrease after adding the same amount of water?
Answer:
1, chicken: pig: horse: sheep = 156: 30: 9: 25.
2. The weight of a large pile of coal is 16 tons, and that of a small pile is 8 tons.
3, 12 days.
4、 15
5, 5 days
6.18km
7.4 1 case
8,26 kg, 18 kg
9, 60 yuan, 7, 5 yuan.
10、 1.5%